Hi there. We're currently in the process of moving, but I can share with you my absolute favorite blog for outdoor playspace inspiration: Let the Children Play. We love her Pinterest boards, too. Great ideas for sensory play, as well!
Our urban preschool just built a second facility and it is wonderful. No "play structure" at all. Very large sand pit for sand/water/tunnel/slide play. Very large hill. Two tall stumps that can hold 2x4s for cars or jumping or running fast. So simply and amazing.